LUCRĂRI ŞTIINŢIFICE SERIA AGRONOMIE

Universitatea de Ştiinţe Agricole şi Medicină Veterinară Iaşi
Fertilization of the potato plots with N:P:K, 100:100:100 kg s.a /ha, in a balanced
rapport, was accomplished.
The tubers were planted semi - mechanically at a distance on 21,5 cm between
tubers and 70 cm between rows, using the fraction on 30-45 mm.
In order to destroy of the potato herbage the first treatment was made
mechanically, at warning – after 70 days from the plant sprouting. The second
treatment was made with Diquat (Reglone forte) 5 l /ha. After three weeks from the
vegetation interruption, the harvesting of the tubers was accomplished.
RESULTS AND DISCUSSIONS
The planting material relative rates, evaluated on basis of the middle data
were dependents, in a biggest manner, on planting time (tab.1). As follow as later
planting with 30 days, the rated capacity was diminished with 32% , that’s mean a
yield diminishing with 56,5q/ha against the early planting.
Table 1
The dependence of the planting material yield (q/ha), by the technological
measures effect
SPECIFICATIONS
Planting
material
(q/ha)
Differences
Significations
Villages
SUCEAVA 140,7 Standard.
Biological
Categories
Cultivars
LUCINA 154,0 13,3 xxx
basis (SE class) 155,5 standard
bază (clasa E) 149,0 - 6,5
Certifiied A 137,7 -17,8 ooo
RAPSODIA 138,6 standard
ASTRAL 156,1 17,5 xxx
Early 175,6 standard
Planting
material AFTER 30 DAYS * 119,1 -56,5 ooo
Vegetation AT WARNING 160,7 standard
interruption AFTER 20 DAYS ** 134,0 -26,7 ooo
DL 5 % = 6,0 q/ha * - at the early planting 1 % = 8,3
0,1 % = 11,5 ** - at warning
The significant decreasing, but more little when the vegetation interruption
was registered after 20 days from warning (17%, that mean 26,7 q/ha). The yield
decreasing with 17,8 q/ha (11%), was registered at the biological category
„Certified A”. This yield decreasing in comparison with obtained yield at the
biological category basis (SE class), is because of meteorological conditions,
taking into consideration that the frequency amplification of the grave viroses was
not so big so that whole yield differences have to attribute them From the other
measures which contributed at the increase of the planting material rated capacity,
the cultivar Astral was on the first place, surpassing the cultivar Rapsodia with 17,5
q/ha, respectively 13 %.
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